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Elucidation of gully erosion characteristics considering the periodicity of unevenness on embankment crest

Research Project

Project/Area Number 19K04611
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22040:Hydroengineering-related
Research InstitutionSaitama University

Principal Investigator

Yagisawa Junji  埼玉大学, 理工学研究科, 准教授 (70549998)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords河川堤防 / 越流 / ガリー侵食 / 堤防天端の凹凸の周期性 / 堤防越流侵食 / 堤防天端凹凸波長 / 天端凹凸波長 / 堤防越流 / 天端上凹凸の周期性
Outline of Research at the Start

越流により生じる裏法面のガリー侵食は,特に越流初期の裏法面の地形を決めるとともに,侵食箇所への流れが集中することで,その後の堤体侵食過程や破堤までの時間,すなわち堤防の粘り強さにも大きな影響を与えることが予想される.しかし,従来の堤防の越流侵食に関する研究では,この初期地形の形成過程は十分に考慮されていない.本研究では,越流初期に生じるガリー侵食の特性を,越流水深,堤防天端の縦断的な凹凸の周期性,堤体材料特性,裏法勾配と関連付けることで,越流後,早期に破堤に繋がるリスクの高い箇所を明らかにする.

Outline of Final Research Achievements

The purpose of this study is to clarify the high-risk points leading to the levee breakage at an early stage, considering the overflow water depth, the periodicity of the longitudinal unevenness of the top of the levee, and the difference in the back slope.
As a result of experiments and numerical analysis, it was clarified that there is a peak uneven wavelength in which the scale of gully erosion (erosion depth) and the distance between adjacent gully are shortened even if the overflow conditions are the same.
This suggests that it is useful to grasp the weak points where the risk of early levee breakage is high by grasping the wavelength of the top unevenness at the points where the risk of overflow is high.

Academic Significance and Societal Importance of the Research Achievements

従来堤防越流を伴う侵食に関する研究は,堤防形状を理想化した状態での評価に留まる研究が多い.本研究では,堤防天端に生じる縦断的な凹凸を考慮した上で,生じるガリー侵食の特性を把握できるため,その学術的意義は高い.本研究で得られた知見は,現存する堤防の越流危険箇所に対して天端の凹凸の状況を把握することで,堤防天端の効率的な補修計画に大きく貢献できると期待され,本研究の工学的,社会的意義は非常に高い.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (2 results)

  • [Journal Article] 難侵食層が法尻周辺の洗堀に及ぼす影響2020

    • Author(s)
      西川 咲良・八木澤 順治
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: 76

    • NAID

      130008122547

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] EXPERIMENTAL INVESTIGATION ON EFFECT OF INITIAL PHREATIC LINE POSITION INSIDE EARTHEN EMBANKMENT ON HEADCUT MIGRATION DURING OVERTOPPING FLOW2020

    • Author(s)
      Md Masum BILLAH・Junji YAGISAWA
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

      Volume: 76

    • NAID

      130008122672

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] 堤防天端の縦断的な凹凸の周期性が越流時の ガリー侵食に及ぼす影響2020

    • Author(s)
      八木澤順治・正村亮太
    • Journal Title

      河川技術論文集

      Volume: 26

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 堤体材料特性に応じた粘性土の限界せん断応力の予測式の提案2020

    • Author(s)
      西川咲良・八木澤順治
    • Organizer
      第47回土木学会関東支部技術研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] Experimental study on local scour at embankment toe doe to overtopping flow2020

    • Author(s)
      Md Masum Billah, Junji Yagisawa
    • Organizer
      JSCE 22nd International Summer Symposium
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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